The final straw for Regnery came about after Dinesh D’Souza‘s latest book The Big Lie: Exposing the Nazi Roots of the American Left, was ranked by the Times at No. 7 while being ranked No. 1 on other lists.

The Times called the notion it would manipulate the list for political reasons “ludicrous.”

“Our goal is that the lists reflect authentic best sellers,” Times spokesman Jordan Cohen said. “The political views of authors have no bearing on our rankings, and the notion that we would manipulate the lists to exclude books for political reasons is simply ludicrous.”

This isn’t the first time the Times’ best-seller list has been called into question by a publisher.

Two years ago the Times excluded Sen. Ted Cruz’s book–A Time for Truth from the list claiming an “overwhelming preponderance of evidence was that sales [of Cruz’s book] were limited to strategic bulk purchases.”

That claim was disputed by Cruz’s publisher Harper Collins and backed up by Amazon which said there was no unusual purchase activity for the book which would have been ranked No. 3 if it hadn’t been excluded.

Regnery may be correct in its claim of bias, but since the Times doesn’t reveal how the best-seller list is compiled it will be virtually impossible to prove.